Not sure where the best place to post this. I have a 2000 7.3L with 260k miles that I bought new. It has gone through 8 pump to hydroboost lines in 2 months. The factory line lasted 13 years. The replacement lasted 5. The last several have failed within 2 weeks, the shortest time was 24 hours. Every time the line has failed at the fitting to the pump. Whatever is holding the flare inside the nut gives way, the flare slips back and all of the fluid dumps through the nut. No one can give me any answer but I have developed a theory over the past couple of days. Wondering if it could be a check valve in the hydroboost that is allowing a pulse back down the line to the pump overpressuring that fitting. I've found mention of a check valve for backup pressure accumulation but can't find a hint as to where it is or how to check or repair anything. I'm getting good at replacing hoses but I would rather not have to keep doing that every week or so.